Although I'd obviously argue there's no GUI library out there as awesome as libecere GUI (and its next iteration), it is a goal to readily support other GUI libraries with other components of the Ecere SDK. There is nothing that would really prevent you from doing so right now anyways, but let me know if you do run into problems!

We want to distribute samples of using various components with e.g. Qt, wxWidgets, and maybe with that one you mention as well.